<?php
    // +----------------------------------------------------------------------
    // | ThinkPHP [ WE CAN DO IT JUST THINK ]
    // +----------------------------------------------------------------------
    // | Copyright (c) 2006~2017 http://thinkphp.cn All rights reserved.
    // +----------------------------------------------------------------------
    // | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
    // +----------------------------------------------------------------------
    // | Author: liu21st <liu21st@gmail.com>
    // +----------------------------------------------------------------------
    namespace think\controller;

    use think\App;
    use think\Request;
    use think\Response;

    abstract class Rest {
        protected $method; // 当前请求类型
        protected $type; // 当前资源类型
        // 输出类型
        protected $restMethodList    = 'get|post|put|delete';
        protected $restDefaultMethod = 'get';
        protected $restTypeList      = 'html|xml|json|rss';
        protected $restDefaultType   = 'html';
        protected $restOutputType    = [ // REST允许输出的资源类型列表
                                         'xml'  => 'application/xml',
                                         'json' => 'application/json',
                                         'html' => 'text/html',
        ];

        /**
         * 构造函数 取得模板对象实例
         * @access public
         */
        public function __construct() {
            // 资源类型检测
            $request = Request::instance();
            $ext     = $request->ext();
            if ('' == $ext) {
                // 自动检测资源类型
                $this->type = $request->type();
            } elseif (!preg_match('/\(' . $this->restTypeList . '\)$/i', $ext)) {
                // 资源类型非法 则用默认资源类型访问
                $this->type = $this->restDefaultType;
            } else {
                $this->type = $ext;
            }
            // 请求方式检测
            $method = strtolower($request->method());
            if (false === stripos($this->restMethodList, $method)) {
                // 请求方式非法 则用默认请求方法
                $method = $this->restDefaultMethod;
            }
            $this->method = $method;
        }

        /**
         * REST 调用
         * @access public
         * @param string $method 方法名
         * @return mixed
         * @throws \Exception
         */
        public function _empty($method) {
            if (method_exists($this, $method . '_' . $this->method . '_' . $this->type)) {
                // RESTFul方法支持
                $fun = $method . '_' . $this->method . '_' . $this->type;
            } elseif ($this->method == $this->restDefaultMethod && method_exists($this, $method . '_' . $this->type)) {
                $fun = $method . '_' . $this->type;
            } elseif ($this->type == $this->restDefaultType && method_exists($this, $method . '_' . $this->method)) {
                $fun = $method . '_' . $this->method;
            }
            if (isset($fun)) {
                return App::invokeMethod([
                                             $this,
                                             $fun
                                         ]
                );
            } else {
                // 抛出异常
                throw new \Exception('error action :' . $method);
            }
        }

        /**
         * 输出返回数据
         * @access protected
         * @param mixed   $data 要返回的数据
         * @param String  $type 返回类型 JSON XML
         * @param integer $code HTTP状态码
         * @return Response
         */
        protected function response($data, $type = 'json', $code = 200) {
            return Response::create($data, $type)->code($code);
        }
    }
